Assume that the same amount of current passes through the electromagnets shown. identify which electromagnet is stronger than the
electromagnet above.

compass can be used day and night, cloudy or sunny

d) physical means can be used to separate the components of air.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.